The Dark Knight yesterday became only the second movie in Hollywood history to gross $500 million or more. The movie now stands within $100 million of toppling Titanic as the biggest-ever movie at the domestic box office.

Elsewhere, Tropic Thunder made it three wins in a row at the weekend box office, with a $14.3 million four-day, holiday take, per studio estimates today from Exhibitor Relations.

The Dark Knight's estimated Sunday gross of $3.3 million put the Batman movie over the $500 million mark only 45 days into its release, per Box Office Mojo stats.

For the Friday-Monday, Labor Day weekend, the Christopher Nolan film made $11 million. Its overall take now stands at $504.7 million.

Titanic rules the all-time box-office chart with a domestic gross of $601 million.

While The Dark Knight has made its money in lightning-fast time, it is not expected to have enough left in the tank to get to $600 million.

Not that $500 million won't get you pretty far. 

Here's a recap of the top-grossing weekend films based on Friday-Sunday estimates compiled by Exhibitor Relations:

  • Tropic Thunder, $11.5 million   • Babylon A.D., $9.6 million   • The Dark Knight, $8.6 million   • The House Bunny, $8.3 million   • Traitor, $7.9 million

  • Death Race, $6.3 million   • Disaster Movie, $6.2 million   • Mamma Mia! $4.4 million   • Pineapple Express, $3.5 million   • Vicky Cristina Barcelona, $2.8 million